MetLife, the largest insurer in the US, was declared “too big to fail” by a government panel on Thursday, despite the insurance giant battling for three months against such a ruling.

MetLife, which uses the “Peanuts” characters for mascots, is now the fourth non-bank company to be labeled a “systemically important financial institution,” or Sifi, by the US Treasury’s Financial Stability Oversight Council.

The others are AIG, Prudential Financial, and General Electric Capital Corp.

The Sifi designation, part of the 2010 Dodd-Frank financial reform law, requires companies to hold more capital and rein in its riskier businesses, as well as face oversight from Yellen’s Federal Reserve.

The company has made no secret that it’s against the designation. CEO Steve Kandarian, in trying to ward off the designation, said that MetLife was a “source of financial strength and stability during times of economic distress — including the 2008 financial crisis.”

The company claims that the designation could hurt business.

The company has 30 days to decide if it will litigate against the decision again.

MetLife rose 4.3 percent on Thursday to $54.03. Trading was flat after-hours, when the company made the announcement.